<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      "use strick";

      function say() {
        // let this=window
        console.log(this);
      }
      say(); //window

      const info = { age: 20, name: "jack" };
      const user = { age: 21, name: "lili" };

      info.talk = say;
      info.talk(); // info

      user.talk = say;
      user.talk(); // user
    </script>
  </body>
</html>
